I’m afraid I ______ return the book to you before Friday. — Take your time.

President Hu Jintao said economic growth is the basis for strengthening defense capability, which is ________ an important indicator of overall national strength.[ ]

It remains to be seen whateffects the new educational reform will _________ students.

Listen ! Helen is singing in the next room.It ____ be Helen. She has gone to Beijing.

The students were made ______ the text tentimes